I have a windows 7 Dell OEM disk for my XPS15 running Home Premium x64. My question is this: a friend of mine also purchased an XPS 15z running the same OS from dell at about the same time. Can he use my disk on his machine or is it machine specific? i.e. is the disk tied to my machine or is it generic and will look for his motherboard and activate accordingly.

To be clear...we both have legitimate licenses for windows 7 Home premium x64 supplied with our dell machines, i'm simply trying to ascertain if there is any problem using the same OEM disk to reinstall windows on both.